Black rot of grapes ( <i>Guignardia bidwellii</i> (Ellis) Viala &amp; Ravaz) in the area of the city of Burgas under the conditions of integrated plant protection

Abstract The study of the disease Black rot of grapes was carried out in the village of Galabets, Pomorie municipality. The study was carried out in the period of 2022 - 2023. The vine varieties that were monitored were Dimyat, Pamid, Misquet red, Chardonnay, Misquet Ottonel, Naslada, June Blanc and Cabernet Sauvignon. In the village of Galabets, the Misquet Ottonel variety is 2.5/1.4 m apart and the other varieties at distances of 3.2/1.4 m. The vines are grafted onto Berlandieri x Riparia SO4 rootstock. The preplanting preparation of the area includes stock fertilization with 40 kg of P2O5, 50 kg of K2O (active substance) and 3 t of stable manure per decare, harrowing, discing and leveling. The vines are planted in pits of 60/60/70 cm. According to McKinney's classification (1923), slightly sensitive /class 1/ are June Blanc and Naslada (0.1-25%), moderately sensitive is the variety Pamid (25-50%). Misquet Otonel, Misquet Red, in fourth variant compared to the other variants and the lowest, are sensitive. This is due to the application of green pruning operations combined with the use of chemical preparations with a proven effect against black rot.